查询词典 mode of vibration

The effect of tribology factors on bearing vibration is studied experimentally. AR model and WPT are used to processing the normal arid abnormal signals. The results are as follows:1. The vibration of ball bearings is caused by the tribology action of contact pairs of ball and ring races and has the essential of tribo-dynamics. Any factors affecting the tribology characteristics of contact pairs will affect vibration and noise of bearings consequently.2. Vibration characteristics of bearing keep almostly unchanged with the increasing of axial load expecting the increasing of nature frequencies. When radial load increasing with axial load unchanged, nature frequencies keep unchanged but some new vibration peaks appears in the spectrum.3. Vibration amplitudes are damped and nature frequency are enhanced with sufficient lubrication. Vibration and noise of bearings increase obviously and roar can happen and the contact surfaces scratch slightly under insufficient and unclean lubrication state. Bearing will be disabled in a few minutes without any lubrication.4. Bearing vibration is unstable under low speed. With the speed increasing, the vibration become stable and natural frequencies increase slightly but the amplitudes increase apparently.5. Bearing vibration can be excited only by some harmonics ofwaviness without lubrication and by all harmonics with lubrication based on the theoretical analysis.6. The nature frequencies of ball bearings decrease with the increasing sizes. When international clearance increasing, nature frequencies decrease in radial and increase in axial and angular and the amplitudes increase in radial and decrease in axial and angular. When the number of balls increasing, nature frequencies increase and amplitudes decrease. When the pitch diameter increasing, axial nature frequency increase and others nearly keep no change. When outer race groove curvature radius increasing, nature frequencies increase in radial and decrease in axial and angular and amplitudes keep no change in radial and increase in axial and angular. When inner race groove curvature radius increasing, nature frequencies decrease and amplitudes increase.7. The distortion in amplitude and frequency components of bearing vibration signals picked up by the present probe measurement method is founded and right conclusions cannot be achieved by the signals. When accelerometer is rigidly screwed with steel stud onto a flat outer surface of a ball bearing, vibration signal can be got without distortion and the reliability of research on bearing vibration is assured.8. AR model is suitable for large samples of bearing vibration signals, square root of length of samples can be used as the upper limitation of order determination and the FPE order selection criterion is effective. Many advantages of AR spectrum are founded over the classical based on FFT.9. Time-Frequency analysis is necessary for abnormal noise of ball bearings. WPT overcomes the principle shortcomings of STFT and proved to be a best tool to process the abnormal signals.

理论分析和试验研究表明： 1球轴承振动是钢球—滚道接触副中的各种摩擦学作用引起的，具有摩擦动力学的本质，任何对接触副的摩擦学特性有影响的因素都将对球轴承的振动和噪声特性产生影响； 2中心轴向载荷作用下，载荷增大使球轴承的固有振动频率升高，载荷越大同样的载荷增幅引起的频率升幅减小，足够大的中心轴向载荷作用下载荷的变化对球轴承振动的频率特性不会产生明显的影响； 3轴向和径向联合载荷作用下，径向载荷不大时球轴承振动的固有频率基本不变，但是可能引起变刚度激励的非线性振动，出现新的频峰，过大的径向载荷将使部分钢球脱离接触，使球轴承的振动和噪声呈现不稳定状态； 4润滑对球轴承的振动和噪声特性有重要的影响，良好的润滑对振动有明显的抑制作用，润滑不充分时，振动和噪声的水平会有明显增高，一定条件下还会激发接触副中的谐振，发出啸声，造成接触表面的伤害，无润滑干接触时，短时的运转就会损伤接触副表面，使振动和噪声迅速增大，并随时可能引发严重的磨损和卡滞失效；接触副润滑良好时，油膜的"刚化效应"使球轴承振动的固有频率有所提高，润滑剂中含有弥散性污浊时，振动的幅度总体升高，但弥散性污浊不会改变球轴承振动的频率特性；浙江大学博士学位论文：球轴承振动的研究 5低速时，球轴承振动的基本特征呈现不稳定状态，随着转速的提高，球轴承振动的频率特性趋于稳定，固有频率频峰升高； 6理论分析表明，干接触时钢球和滚道表面波纹度的某些谐波分量能激励球轴承的振动，振动的幅值与谐波幅值成正比，实际球轴承中钢球的分布不可能完全均匀，波纹度的激励作用会随时发生；润滑接触的分析表明，波纹度的任意谐波分量均能激励球轴承的振动； 7球轴承的几何和结构参数分析表明，球轴承尺寸越大，径向、轴向和角振动的固有频率越低；钢球中心圆直径增大，球轴承的径向和轴向振动的固有频率基本不变，角振动的固有频率有所上升，振动的幅频特性基本不变；径向游隙加大使球轴承的径向振动固有频率降低，轴向和角振动的固有频率有所升高，径向振动幅频特性的幅值升高，而轴向和角向降低；钢球的数量增多使球轴承振动的固有频率上升，幅频特性的幅值下降，径向振动的幅值下降最为明显；外圈沟曲率半径系数增大使球轴承径向振动的固有频率升高，轴向和角振动的固有频率降低，径向幅频特性基本不变，轴向和角向幅频特性幅值升高；内圈沟曲率半径系数增大使径向、轴向和角振动固有频率均下降，振动幅频特性的幅值均有升高； 8试验对比表明，传感器采用探针式安装时，由于探针接触副接触特性的影响，钡(量得到的球轴承振动信号有失真，采用专门设计和制作的试验球轴承，以固定式安装加速度计，首次测量得到了球轴承振动的真实信号，通过对振动信号的分析，验证了球轴承振动的理论模型； 9)基于时间序列分析的AR模型适用于大样本球轴承振动信号的分析，以样本长度的均方根值作定阶上界，FPE做判阶准则，给出的AR谱光滑，频率分辨率高，是球轴承振动分析的简便而可靠的手段； 10以时频域分析的小波包变换分析球轴承异音信号能够比较好地定位和聚焦异音发生的时间，时间间隔，频率范围，同样是球轴承振动分析的可靠的手段，可用作球轴承故障诊断技术。

Study 2 used 2(conflict target: supervisor/subordinate)×3(conflict management mode: integrating/obliging/dominating ) design, letting participants to evaluate the effeciency and appropriateness of the management mode used in the contexts. The results showed:(1) the integrating mode were perceived most efficient and appropriage within the three conflict modes;(2) the interaction between the referent role of conflict object and the management mode is significant, which means when the conflict took place with the supervisor, the participants thought the obliging mode was more appropriate and efficient , while when it took place between the subordinate, they thought the dominating mode was more appropriate and efficient than obliging mode.(3)the interaction between SDO and conflict management mode is significant, which means the participants with high SDO would make no preference between obliging and dominating mode, but the participates with low SDO would favor the dominating rather than obliging mode;(4) the interaction between dialectical ways of thinking and conflict management mode is significant, the lower the level of dialectical way of thinking the participants were, the more difference were found between the appraisal of obliging and dominating mode.(5) the moderating effect of SDO and dialectical ways of thinking to the relationship between conflict object and management mode were not significant, which means the relative position of conflict object in China is so strong that can't be affected by SDO and dialectical ways of thinking.

研究二采用2*3（冲突处理方式：迁就/支配/整合）的情境设计，让被试对情境中冲突主角的冲突处理方式进行恰当有效性的评价，结果显示： 1、在与上级或下级发生冲突时，被试对迁就、支配和整合三种策略中整合式的恰当有效性的评价最高；2、冲突对象的相对地位与冲突处理方式之间的交互作用显著，即当与上级发生冲突时，被试认为使用迁就的处理方式比支配的方式更恰当有效，而与下级发生冲突时，被试则认为使用支配的处理方式比迁就的方式更有效； 3、SDO与冲突处理方式之间的交互作用显著，即SDO水平高的被试对迁就式与支配式的认知评价没有差异，而SDO水平低的被试对支配式比迁就式有更高的评价；4、辩证思维水平与冲突处理方式之间的交互作用显著，即低辩证思维水平的个体比高辩证的个体对支配式与迁就式的评价差异更大；5、SDO水平及辩证思维方式水平对冲突对象影响冲突处理方式评价的程度的调节作用不显著。

ChapterⅢ,system model of chapter II was simplified as the free vibrationmodel of the system to solve the inherent vibration frequency and vibration mode.The inherent vibration modes are divided into three categories:torsional vibrationmode of central component,translational and torsion pendulum vibration mode of thecenter component and planetary gear vibration mode.

第三章对第二章建立的系统模型简化为自由振动模型，求解了系统的固有振动频率及振型，将各工况下的固有振型分为三类：中心构件扭转振动模式、中心构件平移扭摆振动模式和行星轮振动模式。

Based on the system feedback archetype mode theory, the dissertation introduce the upper limit stepwise generation and elimination method of the system pullulate upper limit mode, construct the five upper limit archetype mode such as: market demand upper limit archetype mode, human resource upper limit archetype mode; fund upper limit archetype modes; technology innovation upper limit archetype mode; government support upper limit archetype mode ;By combining the five upper limit archetype mode ,we can attain a electronic information industry developmental pattern system upper limit archetype mode.

利用系统科学反馈基模分析理论，提出了系统成长上限模型上限逐步生成与消除法，通过构建江西电子信息产业市场需求成长上限子基模、人力资源不足成长上限子基模、政府支持有限成长上限子基模、资金不足成长上限子基模、创新能力不足成长上限子基模等5个基模，并对其做并运算，得到了江西电子信息产业系统成长上限基模，刻画了资金、市场、技术创新、人才与政府支持相互制约的关联关系。

Secondly, On the basic of existing research about mode classification of E-U-R cooperation, combine high school in Xinjiang in the aspects of producing to learn to grind to cooperate of actual, high school in Xinjiang in the research result conversion, product and technical developments and produce to learn to grind the cooperation to induce appliedly serves to consult with the mode, technique to turn to let with technique for the technique the mode, cooperation development mode, set up the entity mode, school to do the industry mode, the university science and technology park totally of the mode six greatest modes, detailed analyzed the influence factor, merit and shortcoming of the manifestation, characteristic, implement of a mode and open the exhibition circumstance in Xinjiang, return for a mode chose the typical model with meticulous care of case example.

其次，在参考现有研究对产学研合作模式分类的基础上，结合新疆高校在产学研合作方面的实际，把新疆高校在科研成果转化、产品和技术的开发和应用方面的产学研合作归纳为技术服务和技术咨询模式、技术转让模式、合作开发模式、共建实体模式、校办产业模式、大学科技园模式六大模式，详细分析了每种模式的表现形式、特征、实施的影响因素、优缺点以及在新疆的开展情况，还为每种模式精心选择了典型的案例。

First, the rural social security system should be developed in accordance with the national conditions, including economic and social development status quo, people's views and security traditions. Next, the thesis puts forward the guiding thought and general principles for the establishment of the system based on the national conditions, and clearly sets forth the idea of establishing the transitional rural social security system. Then, the thesis makes explanation and analysis respectively on the existing security types, hoping to find the proper components of the rural social security system that is suited to the conditions of the country. At last, the thesis puts forward the objective mode and transitional mode of the establishment of the system at the macro level. The objective mode is the development direction of the transitional mode, and the transitional mode is a necessary stage of the objective mode. Only when establishing the vigorous transitional mode that is suited to the national conditions and achieving development, can the objective mode be possibly realized in the self-evolution of the transitional mode.

首先，我国农村社会保障制度建设应当立足于我国的基本国情，包括经济社会发展现状、人们的观念、保障传统等方面；其次，在基本国情的基础上提出了建立我国农村社会保障制度的指导思想和一般原则，明确提出了建立过渡型农村社会保障制度的构想；而后，本文对农村社会保障现存的几种保障方式一一做出了说明和分析，以期为构建适合我国国情的农村社会保障制度模式找到合适的构成要素；最后，本文从较为宏观的层次提出了我国农村社会保障制度建设的目标模式和过渡模式，目标模式是过渡模式的发展方向，而过渡模式是目标模式建设的必经阶段，只有在建立适合国情具有活力的过渡模式并取得发展的基础上，目标模式才有可能在过渡模式本身的自我升级过程中逐步实现。

The vibration modes in ABA sandwich 180°domain structure have been analysized, it was found that the FDLW includes symmetric vibration mode and aymmetric vibration mode. A new asymmetric vibration mode have been found in the two Layer 180°domain structure with two metalized surfaces.

并指出基模色散特性的差别主要来自于畴层结构的不对称，铁电畴层波是畴最不对称情况下压电耦合的结果，随着层数目的增加，奇数层和偶数层的这种基模色散的差异将逐步减少，最终趋于铁电畴层弯曲波。

According to structural characteristics of floating slab tracks, a track segment element was taken between two adjacent fasteners. For each element, rails were regarded as Euler beams supported by discrete viscoelastic supports. The fasteners and rubber supports were replaced by a linear spring and damp. So the vibration model of the floating slab track was established. In constructing vibration model of a metro train, each car of the metro train with two suspensions was modeled as a multi-rigid body system, in which rigid bodies were connected with each other by a linear spring and damp. Combining the potential energy of vertical vibration of the track with that of the metro train, the total potential energy of vertical vibration of the train and track was obtained. And then, the matrix equation of vertical vibration of the system was established using the principle of total potential energy with stationary value in elastic system dynamics and the "set-in-right-position" rule for formulating system matrices. The vibration responses of the system can be obtained by solving the matrix equation with the direct time integration such as Wilson-θ method.

摘 要：针对浮置板式轨道结构特点，取相邻2个扣件之间的轨道为1个轨段单元，钢轨视为连续弹性点支承Euler梁，浮置板视为弹性薄板，扣件系统及橡胶支座均模拟为线性弹簧及粘滞阻尼器，建立浮置板式轨道振动模型；将城轨列车中的车辆均离散为多刚体系统，各刚体之间通过线性弹簧及粘滞阻尼器相连，建立列车振动模型；将浮置板式轨道及列车振动势能叠加，得到系统竖向振动总势能；基于弹性系统动力学总势能不变值原理及形成系统矩阵的"对号入座"法则，建立此系统竖向振动矩阵方程；采用Wilson-θ逐步积分法求解此矩阵方程，得出此系统竖向振动响应。

The distribution of gear's contact stress, root stress, and contact engagement line in the engagement situation of gear pairs, were obtained on the base of explicit integration method. 3. Adopting the method of system matrix, the torsional vibration differential equation of general shafting was gained. The simple harmonic forms of excitation torque under the normal combustion or piston flameout of in-line engine and v-type engine were analysed. The decoupled algorithm of free vibration and forced vibration and the solution to the vibration damper's energy of resistance and the off-resonance calculation were studied. The sensitivity formulations of the natural frequency and vibration mode to physical parameters of system were derived by solving the eigenvalue problem. These sensitivity formulations provided the theoretical base for the dynamic modification of structure.

运用系统矩阵法建立了轴系的扭振微分方程，并对直列和V型发动机在正常发火和气缸熄火工况下的激振力矩进行了详细的简谐分析；基于精确方法推导了自由振动和强迫振动的解耦算法，给出了能量法计算中的减振器阻尼功求解和非共振计算方法；并研究了曲轴系扭振非线性分析中的变惯量问题，得到了单缸转动惯量的精确求解公式以及变惯量和固有频率的关系式；最后，从特征方程和振型正交性出发，推导了固有频率和振型对轴系转动惯量和刚度等物理参数的灵敏度，为扭振系统的结构动力学修改提供了理论基础。

In the experimental work, application of proportional controller to active vibration control incorporated with passive vibration isolator to suppress its resonant oscillation of natural frequency is studied in this project. Vibration acceleration acquired from accelerator is inputted to controller as feedback signal. The processed signal from controller is transmitted to voice coil actuator to control vibration. Firstly, based on the theoretical equations which govern the system vibration, the physical mechanism of active control in total system is studied.

在实验部分，则运用比例控制器进行被动式隔振系统自然频率共振抑制之主动控制实验，控制回馈讯号采用加速规量得之振动加速度值，经由控制器计算输出控制讯号驱动音圈致动器进行主动控制。

Looking to bounce back from defeat against Cesena last weekend, the Calabrian boss will be sticking to his tried and tested 4-3-3, with Lopez and Sedivic joined up front in Giampaolo's absence by either Nanni or Plasmati.

鉴于上周末对切塞纳的比赛中反败为胜，这支南方球队将会更坚持其一贯而有效的4-3-3阵型，洛佩斯和塞德维奇将取代受伤缺席的詹保罗，和纳尼或者帕斯马蒂中的一个搭档锋线。

Meanwhile, their exposure to the more freewheeling ways of the West broadened dramatically.

另外，西方较自由的生活方式对年轻人的影响增大。